Apparatus for use in administering gases, vapors, and the like



' H. w; c. SCHRDER APPARATUS FOR USE IN ADMINISTERING GASES, VAPQRS, AND THE LIKE Filed June 1 1923 IIIII-IIn@ I lli Patented Feb.`19,

UNITED STATES HANS WILHELI CHRISTIAN SCHRODEB., 0F LUBECK, GERMANY ASSIGNOR TO ALEX- ANDER BERNHARD DBGER, 0F FINKELBERG, LUBECK, GERMANY, ELEFRIEDE y DRGEB ADHINISTBATBIX 0F SAID ALEXANDER BERNHARD DRGER, DECEASED.

APPARATUS FOR IN ADMINISTEBING GASES, VAPORS, AND THE LIKE. v

Application led June 8, 1923, Serial' No. 644,225, and in Germany September 26, 1922.

This invention relates to a mixing and measuring valve for use in apparatus designed for administering gases, vaporsand the like, particularly in simultaneously administering two or more dlferent gases &c., and has for one of its objects to lmprove the valve. disclosed in I ny U. S. Patent No. 1,527,927, granted February 24, 1925. Since the apparatus forming the subjectmatter of my said patent is primarllyintended for the administration of anaesthetlcs, ease of inspection and the possibility of uslng the apparatus quickly with accurate measurement of the anaesthetic are important condxtlons. Moreover the practice of anaesthesis has shown that the scope of utility of the apparatus is extended by simple selective adjustment thereof so that it Imay be utilized to administer, for example, air or oxygen alone, or a mixture of gases, or a mixture of gases with the additlon olf a' further anaesthetic for example ether, or ether alone. By the present invention the conditions before' referred to are eiiiciently fulfilled.

In the accompanying drawing Figure 1 is an elevation of a complete apparatus embodying a mixing and measuring valve constructed according to the invention.

Figure 2 is a view, on a larger scale, illustrating the valve partly in section taken on a vertical plane crossing its axis and passing through the mixing c amber; and

Figurev 3 shows the said valve in central transverse section.

The steel cylinder a contains a gas4 having an anaesthetic action (for example laughing gas, carbonic acid, acetylene, or the like) and the steel cylinder b contains a revivifying gas (for example air or oxygen). B means of a pressure reducing valve c, regu ating screw d, pressure gauge e and stop cock f the res- 'sure of the gas-delivered from the cylinder a I may be adjusted accordingtorequirements and the gas is supplied at this rassure throu h the pipe g to the mixing an measuring v ve h. The pressure of the gas delivered from the cylinder b may likewise be regulated by means of the pressure reducing valve i, regulating screw la pressure gauge Z, cock m, and such gas is supp `ed to the valve h throu h the pipe n. By means of the said valve h w 'ch is shown in detail in Figures 2 and 3, more or less of each of the gases is measured out, for example in quantities of 2, 4, 6, 8 or 10 litres per minute, according to requirements or breathing capacity of the patient. The valve Iz, con

sists of a fixed body o and a rotatable cap or lmember p, the relatively movable engaging the cylinder b flows through the nipple .s into the arcuate chamber t of the body o. In the wall of the cap which abuts against the member o and opposite the chambers r and t are two rows of orifices u and v which are arranged concentrically with the axis of rotation of the valve. The number of the orifices corresponds to the number of stages in litre volumes. The orifices u for the gas from the cylinder a are of equal size, as are likewise the orifices v for the gas from the cylinder I). For the first range of quantities of gases to be mixed, for example two litres, the cap p is rotated to bring one orice of each of its two rows of orifices over or opposite toeach of the chambers r and t; for the second range of.

quantities of gases, for example four litres, two of each of said two rows or orifices are brought opposite each of said chambers and so on.A Both gases mix in the hollow space p in the cap and the mixture is delivered, through the axial passageway of the spindle fw of the cap p, to a branch fw to the multiple way cock ai, which may be of any suitable form, and thence through the tube 2 to the inhaling mask 3. rI he spindle 'w of the cap p extends through and is rotatable in the part o of the valve and an expansive spring w surrounding spindle 'w maintains the cap p in intimate sealing contact with the body o. The arrangement'of separate orifices and their uniform arrangement makes it possible to use only a single scale 011 each of the pressure gauges e y and Z for determining the percentage of each gas delivered according to the adjustment of the pressure in the reducing valves c and z'. The total volume of gas required for breathing is therefore measured out by the valve h and the percentage of the gases to the `total volume is measured independently thereof by adjusting the working pressure according to a scale graduated from 0 to 100 on the rassure gauges e and l. To rapidly adjust t pressure other suitable a pliances, for example eccentric levers, mayA the regulating screws d and lc. l

provided instead oi The advantages of the improved apparatus are obvious; chief among them being the ra.- pidit and accuracy With which the apparatus may e adapted to meet all conditions which have to be taken into account in the administration ofan anaesthetic.

I claim:

The herein-described valve, including a disk-shaped body having a circular recess in one free Jface thereof with diametricaly dis-l posed inlet and outlet ports leading' thereto and through the main face of the recess, said body also being provided with a central opening therethrough, a hollow disk having two incense series of ports through one face and in communication with the chamber thereof, a ho1- low stem concentrically of .and integral with the hollow disk and in communication with the chamber, said stem being mounted for rotation Within the central opening of the rst disk, an operating stem projecting from the outer face of the second disk for oscillating the disk to bring the ports thereof in series registration with the ports of the irst disk,V

and a spring mounted upon the stem and engaging the first disk to hold the disk resiliently seated relatively to each other.

HANS WILHELM CHRISTIAN SCIIRDER. 

